package com.coolweather.android;

import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;

import com.coolweather.android.databinding.ChooseAreaBinding;
import com.coolweather.android.db.City;
import com.coolweather.android.db.County;
import com.coolweather.android.db.Province;
import com.coolweather.android.util.HttpUtil;
import com.coolweather.android.util.Utility;

import org.litepal.LitePal;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;

public class ChooseAreaFragment extends Fragment {
    // 根据级别不同，显示不同列表数据，如果级别为0，则显示省份列表
    public static final int LEVEL_PROVINCE = 0;
    public static final int LEVEL_CITY = 1;
    public static final int LEVEL_COUNTY = 2;

    // 进度对话框
    private ProgressDialog progressDialog;

    // 列表所需的适配器组件
    private ArrayAdapter<String> adapter;
    private List<String> dataList = new ArrayList<>(); // 列表数据

    // 省份列表
    private List<Province> provinceList;

    // 市县列表
    private List<City> cityList;

    // 经列表
    private List<County> countyList;

    // 选中的省份
    private Province selectedProvince;

    // 选中的城市
    private City selectedCity;

    // 当前选中的级别
    private int currentLevel;

    ChooseAreaBinding binding;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        binding = ChooseAreaBinding.inflate(inflater, container, false);
        adapter = new ArrayAdapter<>(getContext(), android.R.layout.simple_list_item_1, dataList);
        return binding.getRoot();
    }

    // 加载省市区数据
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        binding.listView.setAdapter(adapter);
        binding.listView.setOnItemClickListener((adapterView, view, position, id) -> {
            if (currentLevel == LEVEL_PROVINCE) {
                selectedProvince = provinceList.get(position);
                queryCities();
            } else if (currentLevel == LEVEL_COUNTY) {
                String weatherId = countyList.get(position).getWeatherId();
                Intent intent = new Intent(getActivity(), WeatherActivity.class);
                intent.putExtra("current_province", selectedProvince.getProvinceName());
                intent.putExtra("current_city", selectedCity.getCityName());
                intent.putExtra("current_county", countyList.get(position).getCountyName());
                intent.putExtra("weather_id", weatherId);
                startActivity(intent);
                getActivity().finish();
            } else if (currentLevel == LEVEL_CITY) {
                selectedCity = cityList.get(position);
                queryCounties();
            }
        });
        binding.backButton.setOnClickListener(v -> {
            if (currentLevel == LEVEL_COUNTY) {
                queryCities();
            } else if (currentLevel == LEVEL_CITY) {
                queryProvinces();
            }
        });
        queryProvinces();
    }

    private void queryProvinces() {
        binding.titleText.setText("中国");
        binding.backButton.setVisibility(View.GONE);
        provinceList = LitePal.findAll(Province.class);
        if (provinceList.size() > 0) {
            dataList.clear();
            for (Province province : provinceList) {
                dataList.add(province.getProvinceName());
            }
            adapter.notifyDataSetChanged();
            binding.listView.setSelection(0);
            currentLevel = LEVEL_PROVINCE;
        } else {
            String address = "http://guolin.tech/api/china";
            queryFromServer(address, "province");
        }
    }

    private void queryCounties() {
        binding.titleText.setText(selectedCity.getCityName());
        binding.backButton.setVisibility(View.VISIBLE);

        countyList = LitePal.where("cityId = ?", String.valueOf(selectedCity.getId())).find(County.class);
        if (countyList.size() > 0) {
            dataList.clear();
            for (County county : countyList) {
                dataList.add(county.getCountyName());
            }
            adapter.notifyDataSetChanged();
            binding.listView.setSelection(0);
            currentLevel = LEVEL_COUNTY;
        } else {
            int provinceCode = selectedProvince.getProvinceCode();
            int cityCode = selectedCity.getCityCode();
            String address = "http://guolin.tech/api/china/" + provinceCode + "/" + cityCode;
            queryFromServer(address, "county");
        }
    }

    private void queryCities() {
        binding.titleText.setText(selectedProvince.getProvinceName());
        binding.backButton.setVisibility(View.VISIBLE);

        cityList = LitePal.where("provinceid=?", String.valueOf(selectedProvince.getId()))
                .find(City.class);
        if (cityList.size() > 0) {
            dataList.clear();
            for (City city : cityList) {
                dataList.add(city.getCityName());
            }
            adapter.notifyDataSetChanged();
            binding.listView.setSelection(0);
            currentLevel = LEVEL_CITY;
        } else {
            int provinceCode = selectedProvince.getProvinceCode();
            String address = "http://guolin.tech/api/china/" + provinceCode;
            queryFromServer(address, "city");
        }
    }


    private void queryFromServer(String address, String type) {
        showProgressDialog();
        HttpUtil.sendOkHttpRequest(address, new Callback() {
            @Override
            public void onFailure(@NonNull Call call, @NonNull IOException e) {
                //通过runOnUiThread()方法回到主线程处理逻辑
                getActivity().runOnUiThread(() -> {
                    Toast.makeText(getContext(), "加载失败！", Toast.LENGTH_SHORT).show();
                });
            }

            @Override
            public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException {
                String responseText = response.body().string();
                boolean result = false;
                if ("province".equals(type)) {
                    result = Utility.handleProvinceResponse(responseText);
                } else if ("city".equals(type)) {
                    result = Utility.handleCityResponse(responseText, selectedProvince.getId());
                } else if ("county".equals(type)) {
                    result = Utility.handleCountyResponse(responseText, selectedCity.getId());
                }
                if (result) {
                    getActivity().runOnUiThread(() -> {
                        closeProgressDialog();
                        if ("province".equals(type)) {
                            queryProvinces();
                        } else if ("city".equals(type)) {
                            queryCities();
                        } else if ("county".equals(type)) {
                            queryCounties();
                        }
                    });
                }
            }
        });
    }

    private void showProgressDialog() {
        if (progressDialog == null) {
            progressDialog = new ProgressDialog(getActivity());
            progressDialog.setMessage("正在加载...");
            progressDialog.setCancelable(false);
        }
        progressDialog.show();
    }

    private void closeProgressDialog() {
        if (progressDialog != null) {
            progressDialog.dismiss();
        }
    }


}
